直接光：

Scene：Lights：DirectLighting：InjectTranslucencyVolume

TranslucentLightInjectionShaders.usf

void InjectMainPS(FWriteToSliceGeometryOutput Input,out float4 OutColor0 : SV_Target0,out float4 OutColor1 : SV_Target1)
{OutColor0 = 0;OutColor1 = 0;float3 TranslatedWorldPosition;{float ZPosition = View_TranslucencyLightingVolumeMin[VolumeCascadeIndex].z + (Input.LayerIndex + .5f) * View_TranslucencyLightingVolumeInvSize[VolumeCascadeIndex].w;TranslatedWorldPosition = float3(View_TranslucencyLightingVolumeMin[VolumeCascadeIndex].xy + Input.Vertex.UV / View_TranslucencyLightingVolumeInvSize[VolumeCascadeIndex].xy - .5f * View_TranslucencyLightingVolumeInvSize[VolumeCascadeIndex].w, ZPosition);}float3 WorldPosition = TranslatedWorldPosition -  LWCToFloat( GetPrimaryView() .PreViewTranslation) ;float3 VolumeUVs = float3(Input.Vertex.UV, (Input.LayerIndex + .5f) * View_TranslucencyLightingVolumeMin[VolumeCascadeIndex].w);float Masking = 1.0f;{float3 LightVector = DeferredLightUniforms_TranslatedWorldPosition - TranslatedWorldPosition;clip(1.0f / (DeferredLightUniforms_InvRadius * DeferredLightUniforms_InvRadius) - dot(LightVector, LightVector));}float3 NormalizedLightVector = GetNormalizedLightVector(TranslatedWorldPosition);float3 TranslatedWorldPositionForLighting;float3 WorldPositionForLighting;{float VoxelSize = View_TranslucencyLightingVolumeInvSize[VolumeCascadeIndex].w;float3 LightingOffset = 1 * GetBoxPushout(NormalizedLightVector, .5f * VoxelSize);WorldPositionForLighting = WorldPosition + LightingOffset;TranslatedWorldPositionForLighting = TranslatedWorldPosition + LightingOffset;}{float3 WorldLightVector;float Attenuation = CalcLightAttenuation(TranslatedWorldPositionForLighting, WorldLightVector);bool bPointLight = false;bool bSpotLight = false;bPointLight = SpotlightMask < 1;bSpotLight = SpotlightMask >= 1;bool bUnused = false;float ShadowFactor = ComputeVolumeShadowing(TranslatedWorldPositionForLighting, bPointLight, bSpotLight, bUnused);ShadowFactor *= GetLightFunctionShadowFactor(TranslatedWorldPositionForLighting);if (VolumeCascadeIndex == 1){float TransitionScale = 10;float3 FadeUVs = VolumeUVs * (1 + 4 * View_TranslucencyLightingVolumeMin[VolumeCascadeIndex].w) - 2 * View_TranslucencyLightingVolumeMin[VolumeCascadeIndex].w;float3 LerpFactors = saturate((.5f - abs(FadeUVs - .5f)) * TransitionScale);float FinalLerpFactor = LerpFactors.x * LerpFactors.y * LerpFactors.z;Attenuation = lerp(0, Attenuation, FinalLerpFactor);ShadowFactor = lerp(0.0f, ShadowFactor, FinalLerpFactor);}float3 Lighting = DeferredLightUniforms_Color / PI * Attenuation * ShadowFactor;FTwoBandSHVectorRGB SHLighting = MulSH(SHBasisFunction(NormalizedLightVector), Lighting);float DirectionalLightContribution = 0;OutColor0 = float4(SHLighting.R.V.x, SHLighting.G.V.x, SHLighting.B.V.x, DirectionalLightContribution);float3 LuminanceWeights = float3(.3, .59, .11);float3 Coefficient0 = float3(SHLighting.R.V.y, SHLighting.G.V.y, SHLighting.B.V.y);float3 Coefficient1 = float3(SHLighting.R.V.z, SHLighting.G.V.z, SHLighting.B.V.z);float3 Coefficient2 = float3(SHLighting.R.V.w, SHLighting.G.V.w, SHLighting.B.V.w);OutColor1 = float4(dot(Coefficient0, LuminanceWeights), dot(Coefficient1, LuminanceWeights), dot(Coefficient2, LuminanceWeights), 0);}OutColor0 *= Masking;OutColor1 *= Masking;
}

间接光生成：

Scene：DiffuseIndirectAndAO：TranslucencyVolumeLighting

有些复杂，后面需要再看。